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Home / DTC / P20E1 — Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic

P20E1 — Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic

Detailed page for trouble code P20E1.

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P20E1

Generic P — Powertrain

Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic

Brand: Generic
Type: P — Powertrain
Views: UK: 17 EN: 37 RU: 17
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Page language: EN

Causes

  • Damaged, corroded or loose sensor connector or wiring (intermittent open/short)
  • Faulty exhaust aftertreatment fuel pressure sensor
  • Intermittent ground or reference voltage (5V) supply to the sensor
  • Contamination, internal sensor failure, or moisture intrusion
  • Intermittent pump or pressure transducer mechanical issue causing spikes
  • ECU/module fault or internal input circuit problem

Symptoms

  • Malfunction Indicator Lamp (MIL) or check engine light illuminated
  • Aftertreatment/DEF dosing warnings, limited dosing or limp modes
  • Poor aftertreatment performance, increased NOx or failed emissions tests
  • Possible reduced engine power or restricted operation in some vehicles
  • Inconsistent or erratic pressure readings in live data

What to check

  • Read freeze-frame and complete DTC list with a scan tool; note runtime and conditions
  • View live data for the exhaust aftertreatment fuel pressure sensor while key on and during engine operation
  • Inspect sensor connector and wiring for corrosion, loose pins, chafing, or damage
  • Perform a wiggle test on harness/connectors while monitoring live data for signal dropouts
  • Backprobe sensor connector to verify reference voltage (typically ~5 V), sensor ground, and signal voltage
  • Measure continuity/resistance from sensor pins to ECU to check for intermittent opens or shorts

Signal parameters

  • Reference supply: typically a stable 5 V reference (verify with vehicle spec)
  • Signal output: normally a proportional DC voltage (typical range ~0.5–4.5 V depending on pressure and sensor type)
  • Ground: low resistance connection to chassis/ECU ground
  • No abrupt voltage spikes, dropouts, or oscillations during normal operation
  • Open-circuit: very high resistance or no signal; short-to-ground: ~0 V; short-to-battery: ~battery voltage

Diagnostic algorithm

  1. Retrieve code, freeze frame and relevant live data. Note operating conditions when fault set.
  2. Visually inspect the sensor, tubing/pressure line, connector and wiring for damage, corrosion or contamination.
  3. With key on (engine off), backprobe connector and verify reference voltage (≈5 V) and good ground. Record values.
  4. Start engine and monitor the sensor signal voltage while operating the dosing system or inducing pressure changes; watch for instability or dropouts.
  5. Perform a wiggle test of the harness/connector while monitoring live data to reproduce the intermittent behavior.
  6. Check continuity/resistance from sensor pins to ECU connector with harness disconnected; inspect for intermittent opens when flexing harness.
  7. Use an oscilloscope to capture transient spikes, noise or irregular waveform that a DVM may miss.
  8. If wiring and power/ground are good, substitute a known-good sensor (if available) or replace the sensor and retest.
  9. After repair, clear codes and perform a road/operational test to confirm the fault does not return.
  10. If fault persists with verified sensor and wiring, consider ECU/input module diagnosis or replacement per manufacturer procedures.

Likely causes

  • Wiring harness or connector corrosion/damage near sensor (most common)
  • Sensor element failing internally or suffering from contamination
  • Poor ground or intermittent reference voltage at sensor
  • Intermittent open/short between sensor and PCM

Fault status

⚠️ Status
Intermittent/erratic signal detected from exhaust aftertreatment fuel pressure sensor circuit. Possible wiring, connector, sensor or module issue.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P20E0 P20E2 P0191 P0192 P0193
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